This is a very old entry — images are small, formatting is off.
Established in 1981, the Preservation Alliance of Minnesota is a nonprofit organization “advocating for the preservation of Minnesota’s historic resources.” Its original logo, we are told, was not crystal clear what it was. What it was: a drawing from a terra cotta tile on the Saint Paul Building in Saint Paul, Minnesota, one of the first buildings that the Preservation Alliance of Minnesota held an easement on. A new, much clearer logo, was introduced earlier this year. Press release here.